Method resume

common/log.cpp:254–285

    }

    void resume() {
        std::lock_guard<std::mutex> lock(mtx);

        if (running) {
            return;
        }

        running = true;

        thrd = std::thread([this]() {
            while (true) {
                {
                    std::unique_lock<std::mutex> lock(mtx);
                    cv.wait(lock, [this]() { return head != tail; });

                    cur = entries[head];

                    head = (head + 1) % entries.size();
                }

                if (cur.is_end) {
                    break;
                }

                cur.print(); // stdout and stderr

                if (file) {
                    cur.print(file);
                }
            }
        });
    }

    void pause() {
        {